package com.example.sky20.dao;

import com.example.sky20.Bean.NewsBean;
import com.example.sky20.util.DBConnection;
import com.example.sky20.util.Time;

import java.sql.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class NewsDao {
    DBConnection DBConn = new DBConnection();
    //todo 完成增删改查功能
    public List<NewsBean> getList(int page) {
        Connection conn = DBConn.getConn();
        String sql = "select * from news limit "+(page-1)*10+",10";
        List<NewsBean> list = new ArrayList<>();
        try {
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
                NewsBean newsBean = new NewsBean();
                newsBean.setNewsID(rs.getInt("NewsID"));
                newsBean.setNewsTitle(rs.getString("NewsTitle"));
                newsBean.setNewsContent(rs.getString("NewsContent"));
                newsBean.setNewsTime(Time.getDateTime());
                newsBean.setAdminName(rs.getString("AdminName"));
                list.add(newsBean);
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        return list;
    }

    /**
     * @param newsBean 传入要更新的新闻对象,必须包含新闻id值
     * @return 收影响行数
     */
    public int update(NewsBean newsBean) {
        Connection conn = DBConn.getConn();
        if (newsBean.getNewsID() > 0) {
            try {
                Statement stmt = conn.createStatement();
                String sql = "update news set NamesTitle='" + newsBean.getNewsTitle() + "'"
                        + ",NewsContent+'" + newsBean.getNewsContent() + "'"
                        + ",NewsTime='" + Time.getDateTime() + "'"//更新时使用当前系统时间
                        + ",AdminName='" + newsBean.getAdminName() + "'"//
                        +"where NewsID='"+newsBean.getNewsID()+"'";
                return stmt.executeUpdate(sql);
            } catch (SQLException e) {
                e.printStackTrace();
            }
            return 0;
        }
        return 0;
    }

    public int add(NewsBean newsBean) {
        Connection conn = DBConn.getConn();
        try {//使用预处理执行插入
            String sql = "insert into news(NewsTitle,NewsContent,NewsTime,AdminName) values(?,?,?,?)";
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setString(1,newsBean.getNewsTitle());//将第一个参数设置为标题内容
            pmst.setString(2,newsBean.getNewsContent());
            pmst.setString(3,(new Date()).toString());
            pmst.setString(4,"临时管理员");
            return pmst.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }
    /**
     * 删除功能
     */
    public int deleteNewsByNewsID(int newsID) {
        Connection conn = DBConn.getConn();
        String sql = "delete from news where NewsID=?";
        try {
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setInt(1,newsID);
            return pmst.executeUpdate();
        } catch (SQLException e) {

        }
        return 0;
    }
    public int countPage(){
        Connection conn = DBConn.getConn();
        String sql = "select count(*) from news";
        try {
            Statement statement = conn.createStatement();
            ResultSet rs = statement.executeQuery(sql);//获取查询结果集
            if (rs.next()) {
                return (rs.getInt(1)/10) +1;
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        return 0;
    }

    public int delete(int newsId) {

        return newsId;
    }
}
